In a classic experiment, Tom Schelling used a chessboard to explain how racial segregation can emerge if people have only a mild preference for the color of their neighbor. Tim Harford demonstrates (using eggs) in the 2 minute video embedded below. For more, see Tim's post.
Schelling, by the way, mentored Marginal Revolution blogger and George Mason economist Tyler Cowen. I'd pay to be a fly on the way when those two minds came together.
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